Why Does an Aluminum Ring Levitate Above a Magnetic Coil?

[cheez]

A magnetic coil connected to AC power and an aluminum ring. The ring was placed on top of the coil and, although aluminum is non magnetic, the ring was thrown to the ceiling. Explain 1, why was there any force on the ring? 2. Why the ring went up? Use diagram and Faraday's Law

I don't know how to answer these questions. :(
I know the alternating current makes the magnetic field changes. And the changing magnetic field generates emf.But I don't know why the emf is large enough to push the aluminum ring upward, and how come it goes up?

thx a lot.

 

[Tide]

A few more details might help but I would examine the Lorentz force acting on the electrons that were set in motion by the induced EMF.

 

[kyle8921]

I can provide an explanation for the phenomenon described in the content. First, let's start with the concept of Faraday's Law, which states that a changing magnetic field will induce an electromotive force (emf) in a conductor. In this case, the alternating current passing through the coil creates a changing magnetic field around it.

Now, let's look at the aluminum ring. While aluminum itself is not magnetic, it is still a good conductor of electricity. When the ring is placed on top of the coil, it becomes part of the circuit and experiences the changing magnetic field. This induces an emf in the ring, causing a current to flow through it.

According to Lenz's Law, the direction of the induced current will oppose the change that caused it. In this case, the changing magnetic field from the AC current creates an opposing magnetic field in the aluminum ring. This opposing magnetic field repels the changing magnetic field, creating a force that pushes the ring upward.

To better understand this concept, let's look at a diagram:

[Diagram: Coil with alternating current and aluminum ring on top]

As the AC current changes direction, the magnetic field around the coil also changes. This induces an emf in the aluminum ring, creating an opposing magnetic field that pushes against the changing magnetic field from the coil. This repulsive force is what causes the ring to be thrown upwards.

In summary, the force on the ring is due to the interaction between the changing magnetic fields from the AC current and the induced current in the aluminum ring. The ring goes up because of the repulsive force between these two magnetic fields. I hope this explanation helps to clarify the phenomenon described.